﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Demo
{
    class BirdType:Animal
    {
        public int swing;
        public int Swing
        {
            get { return this.swing; }
            set { this.swing = value; }
        }

        public void Feather()
        {
            Console.WriteLine("我有{}对翅膀", this.swing);
        }

    }
}
